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BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
Arjuna Subject : -
Articles 367 Documents
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Petunjuk Penulisan Berkala Fisika Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Vol 17 No.1 2014
Penyetaraan Nilai Viskositas terhadap Indeks Bias pada Zat Cair Bening Eka Jati, Bambang Murdaka; Karyono, Karyono; Supriyatin, Supriyatin
BERKALA FISIKA Vol 13, No 4 (2010): Berkala Fisika
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The research to find out of the relation between viscosity of the liquid (using Viscosimeter Ostwald) to their indeks of refraction (using ABEE refractometer) have been done. It has been chossed the solution of sugar and also solution of salt, at some percentage of concentration (shown on that density variation), and measured their viscosity. Then, those solutions are measured their indeks of refraction. After that, it would be found the relation between their viscosity to their indeks of refraction. The conclusion, it could be found quite linearly graph of viscosity to indeks of refraction of sugar and salt solution for 10 up to 100% in concentration. This relation depends on kind of solution.   Key words: viscosity, indeks of refraction, transparent liquid
Pengaruh Ukuran Butir Terhadap Porositas dan Permeabilitas pada Batupasir Nurwidyanto, M. Irham; Yustiana, Meida; Widada, Sugeng
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
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It has been done a research to know the influence of grain size to permeabiality and porosity on sandstones from Ngrayong Formation, Ledok Formation, Kerek Formation and Selorejo Formation. The Permeability is measured by RUSKA Permeameter Gas, while the porosity is measured by  Porosimeter Gas A-9756 series. The grain size is then determined  using grain size analysis method. After the calculation, the grain size is attributed to permeability and porosity of sandstones with the analysis regresi method. Results obtained indicate that the influence of grain size significant at six sandstones. Based on the statistic calculation it has been obtained the relation  with Linear regression  equation Log k= -5.7 Log d + 15 with r2=0.7, for the grain size to permeability and = -1.9x102d +75 with  r2=0.7,  for the relation of grain size to porosity.   Key Word: sandstone, grain size, porosity, permeability
PENGARUH PENAMBAHAN POLIMER EMULSI VINYL ACECATE CO ACRYLIC PADA TANAH LEMPUNG TERHADAP UJI PERMEABILITAS MELALUI CONSTANT HEAD PERMEABILITY TEST Halauddin, Halauddin; Suhendra, Suhendra
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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Permeability is rate of movement an fluid in soil through a media  have relation pore micro and macro way, happen of vertical and horizontal. Permeability of soil depend on pore mean size measure influenced by particle size measure distribution, viscosity, particle form and soil structure. Smaller soil particle size measure, smaller also pore size measure and progressively lower ability of the soil to overcome fluid. This research aim to know the level of permeability coefficient value of soil residing in gristle area slide by pass Bengkulu Kepahiang by using method permeameter of permeability head constant by comparing given by permeability value is emulsion polymer and do not give by type emulsion polymer of  poly vinyl acetate co acrylic (PVA). This research have done in laboratory have the character of pure experiment and conducted sometime. From result of research, obtained that: value permeability of biggest soil before given by emulsion polymer of PVA there are at location III equal to 8,62.10-3 cm/s, and value permeability of smallest soil before given by emulsion polymer there are at location I equal to 3,87.10-3 cm/s. While value permeability of biggest soil after given by emulsion polymer of PVA there are at location V equal to 0,96.10-3 cm/s, and value permeability of smallest soil after given by emulsion polymer there are at location IX equal to 0,10.10-3 cm/s.   Keywords: Permeability, constant head permeability, pore of size,  polymer of emulsion and                     poly vinyl acetate co acrylic (PVA).
PENGARUH POLARITAS MEDAN LISTRIK EKSTERNAL DAN SUDUT POLARISASI LASER DIODA UNTUK PENGAMATAN EFEK KERR Wibowo, Hari; Sugiyanto, Eko; Firdausi, K. Sofjan; Marhaendrajaya, Indras
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
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An identification of non linear optics of some material has been carried out. The samples used here are mineral water, salt solution, and sugar solution for various concentrations. A static applied external field E is adjusted to left and right direction. And also, the direction of electric field of laser is varied against E. The magnitude of E used in the experiment is produced by a DC high voltage (0-10 kV) applied on two identical parallel plates. A source of light to the samples is a diode laser of 645 nm and 5 mW. The change of polarization angle of laser b after through the samples is the optical property to be identified. Both of mineral water and salt solution, the effect of polarity of E shows identical results of b vs. E. In case of sugar solution, we obtain a positive gradient for right polarity and negative gradient for left polarity of E. Key words: non linear optics, polarization, polarization angle, Kerr Effect
POLARISASI FLUORESENS PADA VIRGIN COCONUT OIL SETELAH MENGALAMI OZONASI Azzahroh, Muffaricha; Sugito, Heri; Richardina, Very; Azam, Much.; Firdausi, Ketut Sofjan
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
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This study investigates interaction effects between ozone and Virgin Coconut Oil (VCO) on fluorescence polarization. The ozonation time variations carried out on VCO were 30 minutes, 60 minutes and 90 minutes with ozone flow rates of 0.6L / minute. The degradation of VCO quality due to ozonation was determined by measuring changes in the fluorescence polarization angle of the light emitted by the sample, using a green laser pointer with a wavelength of 532 nm. Typical fluorescence polarization characteristics in the range of polarization angle variations from  = 0 to  = 180 are in accordance with the results of previous studies. Increasing the length of ozonation in the sample results in an increase in fluorescence polarization. The average fluorescence polarization in the range 0    180 rises linearly over the duration of ozonation, which indicates that ozone interactions are quite effective in degrading the quality of VCO. The validation results also obtained that the duration of ozonation also increases the amount of free fatty acids, however it needs to be further investigated whether the amount of free fatty acids directly contributes to fluorescence polarization. The study of interaction of ozone in solution in biophysics and also its benefits for skin therapy in medical science are very interesting to be further conducted.Keywords: Fluorescence polarization, Virgin Coconut Oil, polarization angle
Sifat Optis Tak-Linear Pada Material KDP Setyawan, Rahmadi; Setiawati, Evi; Marhaendrajaya, Indras; Firdausi, K. Sofjan
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Non-linier optical properties of transparent material Kalium Di- hydrogen Phosphate (KDP) have been identified under the influence of external magnetic fields at wavelength 632.8 nm and 532 nm by using Faraday Effect method. The external  magnetic fields used in this experiment is produced from coils with total turns of 810, wire diameter of 0,8 mm, and soft magnet core, and is flowed by maximum AC current 5 A. The magnitude of magnetic fields can be produced is 194.23 mT. The optical property measured here is rotation of polarization angle ß of the laser beam after passed the transparent material. From the experiment, it is obtained Verdet’s constant value for transparent material KDP is (12.60 ± 0.59) min/G-cm at  = 632.8 nm and (14.93 ± 0.73) min/G-cm at  = 532 nm.   Key words: non-linier optic, KDP, magnetic fields, polarization, Verdet’s constant
REVIEW PENGUJIAN HUKUM MALUS DAN SIFAT OPTIS AKTIF LARUTAN GULA MENGGUNAKAN SISTEM DETEKSI CAHAYA Amitasari, Ria; Istiyawan, Wardono; Sugito, Heri; Bawono P, Ari; Firdausi, K Sofjan
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
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Abstract In this paper, we review the test results of Malus’ Law and optical activity of sugarsolution using a system light detector. Two polarizers were used in the experiment to serve thechoice of a certain direction of electric field of light and to determine the change of polarizationangle. The change of transmitted intensity were measured using LDR detector which was thenacquisitioned by microcontroller and displayed via LCD and computer using  Microsoft Visual Studio C#. The experiment result is in agreement to the Malus’ Law with correlation coefficient of 0.99, and by using the equipment we obtain linearity between the change of polarization angle andconcentration of sugar solution, which is appropriate to the theory, as well. The specific rotarypower is (54±2) o/dm(g/mL) in the experimental uncertainty.Keywords: Malus law, change of polarization angle, light detector
Interpretasi Struktur Bawah Permukaan Daerah Gunung Merbabu – Merapi Berdasarkan Pemodelan 3D Anomali Bouguer Sarkowi, Muh
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Mount Merbabu represent the volcano which keep a lot of mystery because its activity not many known by vulcanology expert. At least existing data about activity of Mount Merbabu cause the its activity characteristic not yet can be expressed surely. Study [of] about characteristic of Mount Merbabu needed to to learn the nature of vulcanisme activity so that action prevetive fall the victim and disaster mitigation can be done early possible.  While the Mount of Merapi represent the most active volcano in the world. In Its activity, eruption Merapi Mount  yield the hot cloud (wedus gembel) with the temperature 3000 º C to  glide the mean reach the distance 4-5 km. In this research we have been done modeling and interpretation of Bouguer anomaly around  Mt. Merapi and Merbabu. Result of research indicate that Mt. Merapi and Merbabu have the negative anomaly which because of existence  magma chamber. The magma chamber in Mt. Merapi have a convex form with the deepnes from 500 – 6000 meter from meas sea level, while the magma chamber in Mt. Merbabu have the same from but rather minimize with the deppnes magma chamber about 1000 – 4000 meter from means sea level.  Magma chamber in Mt. Merapi caontain liquid magma while the solid magma in Mt. Merbabu.   Keywords : Mount Merapi, Mount Merbabu, Gravity
Berkala Fisika Vol. 16 No. 4 Tahun 2013 Berkala Fisika, Tim Redaksi
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Berkala Fisika Vol. 16 No. 4 Tahun 2013

Page 11 of 37 | Total Record : 367

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